package asia.yuanding.wechat.web.netty.handler.impl;

import asia.yuanding.wechat.web.netty.handler.annotation.MessageProcessor;
import asia.yuanding.wechat.web.netty.handler.annotation.NettyMessageHandler;
import cn.hutool.json.JSONObject;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.http.websocketx.TextWebSocketFrame;
import io.netty.util.AttributeKey;
import lombok.extern.slf4j.Slf4j;

/**
 * 文件相关消息处理器
 * 
 * @author Kiro
 */
@Slf4j
@NettyMessageHandler("file")
public class FileMessageHandler {

    @MessageProcessor(value = "upload", async = true)
    public void handleFileUpload(JSONObject reqEntity, ChannelHandlerContext ctx) {
        String fileName = reqEntity.getStr("fileName");
        String fileType = reqEntity.getStr("fileType");
        Long fileSize = reqEntity.getLong("fileSize");
        String userId = getUserId(ctx);
        
        log.info("用户 {} 上传文件: {} ({}, {} bytes)", userId, fileName, fileType, fileSize);
        
        try {
            // 模拟文件处理
            Thread.sleep(2000);
            
            JSONObject response = new JSONObject();
            response.set("type", "file");
            response.set("method", "uploadResult");
            response.set("success", true);
            response.set("fileName", fileName);
            response.set("fileUrl", "/files/" + fileName);
            response.set("message", "文件上传成功");
            
            ctx.writeAndFlush(new TextWebSocketFrame(response.toString()));
            log.info("文件上传处理完成: {}", fileName);
            
        } catch (InterruptedException e) {
            Thread.currentThread().interrupt();
            log.error("文件上传处理被中断", e);
        }
    }

    @MessageProcessor("download")
    public String handleFileDownload(JSONObject reqEntity, ChannelHandlerContext ctx) {
        String fileId = reqEntity.getStr("fileId");
        String userId = getUserId(ctx);
        
        log.info("用户 {} 请求下载文件: {}", userId, fileId);
        
        JSONObject response = new JSONObject();
        response.set("type", "file");
        response.set("method", "downloadResult");
        response.set("fileId", fileId);
        response.set("downloadUrl", "/download/" + fileId);
        response.set("expireTime", System.currentTimeMillis() + 3600000); // 1小时后过期
        
        return response.toString();
    }

    @MessageProcessor("list")
    public String getFileList(JSONObject reqEntity, ChannelHandlerContext ctx) {
        String userId = getUserId(ctx);
        int page = reqEntity.getInt("page", 1);
        int size = reqEntity.getInt("size", 10);
        
        log.info("用户 {} 请求文件列表 (页码: {}, 大小: {})", userId, page, size);
        
        JSONObject response = new JSONObject();
        response.set("type", "file");
        response.set("method", "list");
        response.set("page", page);
        response.set("total", 0);
        response.set("files", new JSONObject[0]);
        
        return response.toString();
    }

    @MessageProcessor("delete")
    public String deleteFile(JSONObject reqEntity, ChannelHandlerContext ctx) {
        String fileId = reqEntity.getStr("fileId");
        String userId = getUserId(ctx);
        
        log.info("用户 {} 删除文件: {}", userId, fileId);
        
        JSONObject response = new JSONObject();
        response.set("type", "file");
        response.set("method", "deleteResult");
        response.set("success", true);
        response.set("fileId", fileId);
        response.set("message", "文件删除成功");
        
        return response.toString();
    }

    private String getUserId(ChannelHandlerContext ctx) {
        Object userId = ctx.channel().attr(AttributeKey.valueOf("uId")).get();
        return userId != null ? userId.toString() : "unknown";
    }
}